how do i record vocals next to a 16 bar loop and export it with it all working ?? tried evrrythang!

2 questions, I have a 10 track 16 bar loop, and a few vocals in an audio track wth a lot of bars in it around 80.. the loop is far into the session at bar 308 to 324.so how do I make the 10 track loop and the one audio track into one then release the song? also when I export audio, how do I export specifically that region of the song'? I have tried copying and pasting the loop but it becomes all sloppy for some reason... so is there a way to record the loop into another audio track without using my shitty laptop microphone and then record that along the vocals ? thanks